ED Note definition lives in core, not covid symptom (core__ed_note)

[comorbidity]

for historical reasons, the ED Note definition truly lives in CORE and not in COVID symptom.
Note that ED NOTE is also referenced by suicidality study, but for suicidality the study criteria changed to also include Psych visits, not just ED visits.

Conclusion: move ED NOTE dependance out of library CORE and into each study (covid and suicide) so that each study can change independently.

CURRENTLY IS IGNORED
CREATE OR REPLACE VIEW covid_symptom__site_ed_note AS
https://github.com/smart-on-fhir/cumulus-library-covid/blob/main/cumulus_library_covid/covid_symptom/site_define.sql#L102

BECAUSE

https://github.com/smart-on-fhir/cumulus-library-covid/blob/main/cumulus_library_covid/covid_symptom/count_covid_prevalence_ed.sql
depends on

https://github.com/smart-on-fhir/cumulus-library-covid/blob/main/cumulus_library_covid/covid_symptom/count_covid_study_period.sql
depends on

https://github.com/smart-on-fhir/cumulus-library-core/blob/main/cumulus_library/studies/core/study_period.sql
depends on

https://github.com/smart-on-fhir/cumulus-library-core/blob/main/cumulus_library/studies/core/setup.sql